RRC ID 2460
Author Lam CS, Rastegar S, Strähle U.
Title Distribution of cannabinoid receptor 1 in the CNS of zebrafish.
Journal Neuroscience
Abstract The cannabinoid receptor 1 (Cb1) mediates the psychoactive effect of marijuana. In mammals, there is abundant evidence advocating the importance of cannabinoid signaling; activation of Cb1 exerts diverse functions, chiefly by its ability to modulate neurotransmission. Thus, much attention has been devoted to understand its role in health and disease and to evaluate its therapeutic potential. Here, we have cloned zebrafish cb1 and investigated its expression in developing and adult zebrafish brain. Sequence analysis showed that there is a high degree of conservation, especially in residues demonstrated to be critical for function in mammals. In situ hybridization revealed that zebrafish cb1 appears first in the preoptic area at 24 hours post-fertilization. Subsequently, transcripts are detected in the dorsal telencephalon, hypothalamus, pretectum and torus longitudinalis. A similar pattern of expression is recapitulated in the adult brain. While cb1 is intensively stained in the medial zone of the dorsal telencephalon, expression elsewhere is weak by comparison. In particular, localization of cb1 in the telencephalic periventricular matrix is suggestive of the involvement of Cb1 in neurogenesis, bearing strong resemblance in terms of expression and function to the proliferative mammalian hippocampal formation. In addition, a gradient-like expression of cb1 is detected in the torus longitudinalis, a teleost specific neural tissue. In relation to dopaminergic neurons in the diencephalic posterior tuberculum (considered to be the teleostean homologue of the mammalian midbrain dopaminergic system), both cb1 and tyrosine hydroxylase-expressing cells occupy non-overlapping domains. However there is evidence that they are co-localized in the caudal zone of the hypothalamus, implying a direct modulation of dopamine release in this particular region. Collectively, our data indicate the propensity of zebrafish cb1 to participate in multiple neurological processes.
Volume 138(1)
Pages 83-95
Published 2006
DOI 10.1016/j.neuroscience.2005.10.069
PII S0306-4522(05)01198-X
PMID 16368195
MeSH Amino Acid Sequence Animals Brain Chemistry / drug effects Brain Chemistry / physiology Central Nervous System / metabolism* DNA, Complementary / biosynthesis DNA, Complementary / genetics Diencephalon / metabolism Diencephalon / physiology In Situ Hybridization Larva Mesencephalon / metabolism Molecular Sequence Data Open Reading Frames / physiology Receptor, Cannabinoid, CB1 / genetics Receptor, Cannabinoid, CB1 / metabolism* Telencephalon / metabolism Telencephalon / physiology Zebrafish / physiology*
IF 3.244
Times Cited 39
Zebrafish ?